Sansui TU-9900 - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 23rd January 2007, 03:21 PM   #1
AMV8 is offline AMV8  United Kingdom
diyAudio Member
 
Join Date: Jan 2005
Location: near london
Default Sansui TU-9900

Hi

I recently purchased a Saansui TU-9900 tuner and I am impressed. It is a great receiver ( the best I have come accross )but the audio electronics seem to let it down slightly. But I thought I can have a go at that part!


Initially I replaced all the electrolytic capacitors with ones of similar values and found an improvement.
However I found that the sound was thin in the base, light on transients and a little confused on complex passages. I guessed that the power supply reservoir was insufficient and increased the capacitance to 1000uf per rail. Things improved. I then increased in increments and found that the transients were there, the base firmer and no confusion on complex passages at 3000uf/4000uf per rail.
I also added polystyrene bypass capacitors ( 0.047uf )and that cleaned up the treble.
The sound is now very good. All I lack is some soundstage and imaging and I am hoping replacing the ic's with more modern ones will provide that.

I initially trawled diyaudio and found some threads and then I was directed to this thread by Netlist ;
Replacement for TA7136P
It explains how to change the opamp for a more modern op amp - I plan to do that shortly.


That's all the changes planned as it sounds so good already - better than my FM4 which I have liked.

Its great to listen to.

Don
  Reply With Quote
Old 23rd January 2007, 05:34 PM   #2
ilimzn is offline ilimzn  Croatia
diyAudio Member
 
Join Date: Feb 2005
Location: Zagreb
Have a go with the search function at the audiokarma.org forum. There is a vintage forum, and within it a Sansui speciffic forum as well. The TU-9900 is very highly regarded and also often modified.
  Reply With Quote
Old 23rd January 2007, 07:48 PM   #3
Netlist is offline Netlist  Belgium
diyAudio Moderator Emeritus
 
Netlist's Avatar
 
Join Date: Jan 2003
Quote:
Originally posted by ilimzn
The TU-9900 is very highly regarded and also often modified.
I like it a lot as well and it's the best I owned thus far.
I once repaired a Onkyo 9090II and consider that as the best I heard.

/Hugo
  Reply With Quote
Old 23rd January 2007, 09:36 PM   #4
diyAudio Member
 
georgehifi's Avatar
 
Join Date: Sep 2003
Location: Manly Australia (Jewel of the Pacific)
Send a message via MSN to georgehifi
This is the mods they did on to make it much better
http://www.fmtunerinfo.com

Sansui TU-9900 (1974, $570, front 1, front 2, back) search eBay
The TU-9900 has 5 gangs and 3 IF filters, two of which have 4 stages rather than a typical ceramic filter's 2 stages, so it's like 5 filters if we count them in the traditional fashion. The TU-9900 is solidly built and our panelists who have used it praise its sound quality and DX performance, but David "A" rates it well below the TU-X1 for sound even though Eric (a non-audiophile) felt that it was "close enough." Our panelist Bob did some mods on his: "The TU-9900 has incredible potential. At first, it just did not open up sonically, but after trying a bunch of things, I nailed it. It is there now. I removed tantulum caps in the signal path. The big gain was replacing the TA-7136P op-amps, which were limiting the sonics in a big way. They are inline 7-pin units, so I had to put in 7-pin inline sockets, and custom modify a standard single op-amp to solder onto a 7-pin header. It was about three hours' work just to make the replacements, but well worth it. I also added six polypropylene caps, along with new power supply caps. With all the mods, the TU-9900 may be one of the top all-around tuners ever built. I have talked to many people who feel that a stock TU-9900 just smokes about everything out there for distant reception capability. If your unit does not astound you, it is broken or out of alignment. It will easily surpass a stock KT-8300 by a decent amount. I think the sonics were the holdback on the 9900s, but not anymore." The TU-9900 is very sensitive and selective in stock form, better than just about any analog tuner that commonly sells for under $500 on eBay. Because it uses LC filters that are encased in metal and plastic enclosures, no one should buy a TU-9900 expecting to replace the filters. The TU-9900 offers many nice features, including a calibration tone and scope outputs. On eBay, the TU-9900 usually sells for around $450-625 but anywhere from $380-800+ is possible, depending on condition, the seller's track record, and fluctuations in demand. [DA][BF][EF]
__________________
Avatar : Production Lightspeed Attenuator
www.lightspeedattenuator.com
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Sansui TU-9900 Restoration and Mods Algar_emi Solid State 49 2nd August 2014 03:10 PM
Sansui TU-9900 schematic Acoustat Solid State 2 4th March 2009 03:14 PM
8530k00+9900? illbatting Multi-Way 4 25th September 2006 12:21 AM
Pioneer sa 9900 David Robert Solid State 1 15th April 2005 06:52 AM


New To Site? Need Help?

All times are GMT. The time now is 12:48 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2